Matrix m-stage hpa-1

[Wei Cao]

Hi Evgeny
First toggle the DSP switches on the bottom of the unit, see if it could be fixed. 
   
If not. Can you find a repair shop to help you to troubleshoot your unit? You can send us picture of the PCB of the unit, we will suggest you to check some point of it.
For your safty, please find a professional to help you doing it.